Measurements of J/ψ→pp

作者：J.Z. Bai, Y. Ban, J. G. Bian, X. Cai, J. F. Chang, H.F. Chen, H.S. Chen, H.X. Chen, J. Chen, J.C. Chen, Jun Chen, M.L. Chen, Y.B. Chen, S.P. Chi, Y. P. Chu, X. Z. Cui, H. L. Dai, Y. S. Dai, Z. Y. Deng, L. Y. Dong, S. X. Du, Zhihong Du, J. Fang, S. S. Fang, C. D. Fu, H. Y. Fu, L. P. Fu, C. S. Gao, M.L. Gao, Ya Gao, Ming Gong, W. X. Gong, S. Gu, Y.N. Guo, Yi-Qing Guo, Z. J. Guo, S. W. Han, F. A. Harris, Jing He, K. L. He, M. He, Xiao-Gang He, Y. K. Heng, H. Hu, Ting Hu, G. S. Huang, Liangsheng Huang, X. P. Huang, X. B. Ji, Qing Jia, Chun-Hua Jiang, X. S. Jiang, D. P. Jin, S. Jin, Y. Jin, Yue Lai, F. Li, G. Li, H.H. Li, J. Li, J.C. Li, Qinghua Li, R.B. Li, Rui Li, Shan Li, Wenyu Li, W.G. Li, X.L. Li, X.Q. Li, X.S. Li, Liang Yu, H. Liao, C.X. Liu, Fang Liu, F. Liu, H.M. Liu, J.B. Liu, Junshuai Liu, R.G. Liu, Y. Liu, Zhaoyu Liu, Zhuolin Liu, G.R. Lu, F. Lu, J. Lu, C.L. Luo, X. L. Luo, F.C. Ma, Xinhua Ma, L.L. Ma, X. Y. Ma, Z. P. Mao, Xiangcun Meng, X. H. Mo, Jing Nie, Z. D. Nie, S.L. Olsen, H. P. Peng, N. D. Qi, C. D. Qian, H. Qin, J. F. Qiu, Zhanli Ren, G. Rong, L.Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, H. Y. Sheng, Feng Shi, X. Shi, L. W. Song, Huiying Sun, S. Sun, Y. Z. Sun, Zhi‐Yuan Sun, X. Tang, N. Tao, Y. Tian, G. Tong, G. Varner, D. Wang, J.Z. Wang, L. Wang, L.S. Wang, Menglei Wang, Meng Wang, P. Wang, P.L. Wang, S.Z. Wang, W.F. Wang, Y. F. Wang, Zhe Wang, Z. Wang, Zheng Wang, Z.Y. Wang, C.L. Wei, Nengyou Wu, Y. M. Wu, X. M. Xia, X. X. Xie, B. Xin, G. F. Xu, H. Xu, Y. B. Xu, S. T. Xue, M. L. Yan, W. Yan, F. Yang, H. X. Yang, J. Yang, Shuo Yang, Yueling Yang, L. H. Yi, Z. Y. Yi, M. Ye, M.H. Ye, Y.X. Ye, Yu Chen, G. Yu, C. Z. Yuan, J. M. Yuan, Yixuan Yuan, Q. Yue, S. L. Zang, Y. Zeng, B.X. Zhang, B.Y. Zhang, C.C. Zhang, D.H. Zhang, H.Y. Zhang, Jiliang Zhang, J.M. Zhang, J.Y. Zhang, J.W. Zhang, L.S. Zhang, Q.J. Zhang, S.Q. Zhang, X.M. Zhang, X.Y. Zhang, Yiyun Zhang, Y.J. Zhang, Yi Zhang, Zehui Zhang, Z.Q. Zhang, Dongxu Zhao, Jiayi Zhao, J. W. Zhao, P. P. Zhao, W. Zhao, X. Zhao, Y. B. Zhao, Z. Zhao, H. Q. Zheng, Jian Zheng, L. S. Zheng, Z. P. Zheng, X. Zhong, B. Zhou, Guomo Zhou, Li Zhou, Nathalie Zhou, K. J. Zhu, Qingjun Zhu, Y. C. Zhu, Y. Zhu, Y. S. Zhu, Zian Zhu, B.A. Zhuang, B. S. Zou · 发表于：Physics Letters B · 年份：2004 · DOI：10.1016/j.physletb.2004.04.022 · 被引用次数：24 · 研究领域：Particle physics theoretical and experimental studies、Quantum Chromodynamics and Particle Interactions、High-Energy Particle Collisions Research

The process J/ψ→pp̄ is studied using 57.7×106 J/ψ events collected with the BESII detector at the Beijing Electron Positron Collider. The branching ratio is determined to be Br(J/ψ→pp̄)=(2.26±0.01±0.14)×10−3, and the angular distribution is well described by dNdcosθp=1+αcos2θp with α=0.676±0.036±0.042, where θp is the angle between the proton and beam directions. The value of α obtained is in good agreement with the predictions of first-order QCD.